Madrid, Spain, September 25th, 2025 - HiTHIUM, a leading global provider of long-duration energy storage technology, today announced the signing of a 2GWh Master Supply Agreement (MSA) with Solarpro – Europe’s leading EPC provider of PV and BESS systems. The agreement will support multiple utility-scale projects across Eastern Europe, including but not limited to Bulgaria, Hungary, Romania, and North Macedonia - regions that are accelerating renewable deployment as part of their energy transition strategies.

Solarpro and HiTHIUM 2GWh BESS Projects Framework Signing Ceremony

Across Eastern Europe, the rapid build-out of renewable energy is reshaping the regional energy mix. Intraday market volatility and cannibalization of the PV profile can be addressed mostly by long-duration energy storage (LDES) solutions. They can absorb surplus generation, release energy during extended low-output periods, and provide the resilience needed to keep the grid reliable as renewable penetration rises. HiTHIUM’s proven strength in LDES, particularly its ∞Power 6.25MWh BESS solution and Solarpro’s great integration capacity deliver the resilience and flexibility Eastern Europe requires to accelerate its energy transition.

Under the MSA, HiTHIUM will supply its advanced bespoke DC block solutions, applying the ∞Power 6.25MWh BESS with our high performance 1175Ah and 587Ah batteries. These products will be deployed exclusively in several utility-scale projects across Europe.

By choosing the 6.25MWh product Solarpro firmly states its position as local market leader not only in EPC volumes but more importantly in daring to lead the market and the region by using and integrating in its projects the most advanced technologies on the market.

“Eastern Europe’s energy transformation requires energy storage solutions that go beyond short-term balancing,” said Kelson Li, Sr. Director of Sales HiTHIUM Europe. “By combining HiTHIUM’s industry-leading long-duration energy storage technology with Solarpro’s deep regional experience in large-scale renewable energy integration, we will deliver projects that turn renewable generation into dispatchable, flexible, and reliable resources, advancing the region’s clean energy transition.”

“At Solarpro, we see long-duration energy storage as a next critical technology upgrade of Europe’s electricity generation mix, already dominated by renewables”, said Konstantin Nenov, Chairman of Solarpro. “Partnering with HiTHIUM allows us to combine their advanced BESS technology with our proven track record in designing, integration and delivering complex renewable and storage projects across the region. Last two years we demonstrated great performance of several large-scale BESS projects under most advanced operational models.”

This strategic cooperation builds on the companies’ established partnership. HiTHIUM and Solarpro have already collaborated on landmark projects in Bulgaria and Hungary that were successfully commissioned in 2024 and 2025, and has since demonstrated reliable performance, backed by HiTHIUM’s strong lifecycle service system that ensures rigorous follow-through from planning through after-sales maintenance. The new agreement not only extends this collaboration but also highlights HiTHIUM’s growing influence in the global energy storage industry.

HiTHIUM has built a robust presence in Europe, with regional and partner warehouses and dedicated technical teams providing on-the-ground support. Building on this foundation, the company has established full-process capabilities in the region—covering project planning and management, localized logistics and supply chain coordination, and after-sales service. Leveraging its three core strengths—in innovation, service, and safety—HiTHIUM has secured a Top 2 global ranking in energy storage in the first half of 2025, reinforcing its leadership in long-duration storage and its commitment to driving the clean energy transition forward.

About HiTHIUM

Founded in 2019, HiTHIUM is a leading global company in renewable energy technology, committed to delivering energy storage solutions centered on advanced energy storage battery and system technologies. With robust research, production, sales, and service capabilities worldwide, HiTHIUM is the only energy storage-focused company to achieve GWh-scale global shipments of lithium-ion ESS batteries. Its customer-centric approach drives cutting-edge products and solutions for customers across more than 20 countries and regions.

About Solarpro

Solarpro is part of Renalfa Solarpro Group GmbH, a Vienna-based clean energy and e-mobility investment group with a focus on renewable energy generation assets.

As a multi-technology integrator, Solarpro specializes in developing and delivering hybrid projects that combine photovoltaic (PV), wind, battery energy storage systems (BESS), and hydrogen solutions. With 18 years of experience and a team of more than 1,500 professionals, the company has designed, built, and integrated over 12 GW of solar capacity and more than 1 GWh of battery storage systems.

A recognized technology innovator, Solarpro leads in the design and digitalization of renewable energy projects, turning them into flexible and manageable assets that align with the dynamic energy market. The company’s expertise has been acknowledged internationally, winning the award for “Best EU Project under 100MW” for the first large-scale energy storage system in the region (55 MWh).

Driven by sustainability, Solarpro also invests in circular economy practices, advancing the recycling of PV modules and batteries to support the clean energy transition.

For more information, please contact at press@solarpro.bg